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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (c) 2015, Eric Koegel <eric.koegel@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <libintl.h>
#include <locale.h>
#include <ftw.h>
#include <glib.h>
#include <glib/gi18n.h>
#include "ck-sysdeps.h"
static void
become_user (uid_t uid)
{
int res;
struct passwd *pwent;
errno = 0;
pwent = getpwuid (uid);
if (pwent == NULL) {
g_warning ("Unable to lookup UID: %s", g_strerror (errno));
exit (1);
}
/* set the group */
errno = 0;
res = setegid (pwent->pw_gid);
if (res == -1) {
g_warning ("Error performing setegid: %s", g_strerror (errno));
exit (1);
}
/* become the user */
errno = 0;
res = seteuid (uid);
if (res == -1) {
g_warning ("Error performing seteuid: %s", g_strerror (errno));
exit (1);
}
}
static int
unlink_cb (const char *fpath,
const struct stat *sb,
int typeflag,
struct FTW *ftwbuf)
{
int ret = ftwbuf->level > 0 ? remove (fpath) : 0;
if (ret) {
g_error ("Failed to remove %s, reason was: %s", fpath, strerror(errno));
errno = 0;
}
return ret;
}
static int
remove_dest_dir (const gchar *dest)
{
int ret;
if ((ret = nftw(dest, unlink_cb, 64, FTW_DEPTH | FTW_PHYS))) {
return ret;
}
errno = 0;
ret = seteuid (getuid ());
if (ret == -1) {
g_warning ("Error performing seteuid: %s", g_strerror (errno));
exit (1);
}
ret = remove (dest);
if (ret) {
g_error ("Failed to remove %s, reason was: %s", dest, strerror (errno));
errno = 0;
}
return ret;
}
int
main (int argc,
char **argv)
{
GOptionContext *context;
gboolean ret;
GError *error;
static int user_id = -1;
static gchar *dest = NULL;
static GOptionEntry entries [] = {
{ "uid", 0, 0, G_OPTION_ARG_INT, &user_id, N_("User ID"), NULL },
{ "dest", 0, 0, G_OPTION_ARG_STRING, &dest, N_("Destination to remove"), NULL },
{ NULL }
};
/* Setup for i18n */
setlocale(LC_ALL, "");
#ifdef ENABLE_NLS
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
#endif
/* For now at least restrict this to root */
if (getuid () != 0) {
g_warning (_("You must be root to run this program"));
exit (1);
}
context = g_option_context_new (NULL);
g_option_context_add_main_entries (context, entries, NULL);
error = NULL;
ret = g_option_context_parse (context, &argc, &argv, &error);
g_option_context_free (context);
if (! ret) {
g_warning ("%s", error->message);
g_error_free (error);
exit (1);
}
/* Ensure we have a dest and that it starts with the correct prefix
* so we don't remove something important.
*/
if (dest == NULL || !g_str_has_prefix (dest, RUNDIR "/user/")) {
g_warning ("Invalid Dest");
exit (1);
}
become_user (user_id);
return remove_dest_dir (dest) == 0 ? 0 : 1;
}
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